Structural design of balustrades: Code compliance, cross-section requirements and case studies

Glass balustrades, typically designed as vertical cantilever structures with rigidly restrained bases, are a prominent feature in buildings, especially in elevated areas such as balconies, staircases, and rooftops, where safety and visual transparency are critical. While offering significant aesthetic and transparency, the inherent brittleness of glass necessitates meticulous structural design to ensure user safety and overall system integrity, as potential customer fallout or other discomfort should be avoided. In view of these, this paper provides a technical synopsis of the structural design principles, material specifications, and code compliance requirements for glass balustrades. It examines major international standards, with particular focus on limit-state criteria. It also addresses comparison of well-known design standards. The research methodology shifts beyond a descriptive overview, instead focusing on a quantitative assessment of how different safety factors and displacement limits influence the structural thickness requirements of laminated glass. The comparative analysis shows that the required glass thickness may vary by 20–30% depending on the adopted safety factors, while maximum deflection limits range from Span/60 to L/250 across standards. In the presented case studies, maximum glass stresses ranged from 7.3 MPa to 37.8 MPa, and deflections ranged from 3.59 mm to 15 mm, all within code-prescribed limits. The findings help engineers identify conservative biases or safety gaps in current regulations, thereby contributing to the development of more robust, evidence-based global standards.